Signaling system



March 3, 1931 H. 1.. A. F. NOZIERES 8 S IGNALING SYSTEM Filed Sept. 11, 1924 HENRI LEON AUGUSTE FlPANgO/S NOZ/EPES INVENTOR ATTORNEY Patented Mar. 3, 1931 in!) ST TE HENRI LEONAU'GUSTE rRAn'goIs nozrnnns, on rams, rnancn J sIGNALmd SYST M Application filed September 11, 1924, Serial na jsaoaa, and in France m nta 15, 1923.

My invention relates to electrical systems and particularly to electrical signaling systems in which electron tubes provided with two grids are employed. My invention also 5 relates to signaling methods.

One of theprincipal objects of my inven tion is the provision of anelectric signaling 1 system in which a large degree of amplifica tion of received oscillations is realized.

Another important object of my invention isto provide four electrode thermionic devices provided with the usual anode, cathode and grid, a space-charge grid between the grid and cathode which has a high potential with respectlto the cathode, the space-charge grid being connected to the anode supply through an impedance, the usual grid'being connected to the cathode'through a second impedance which is coupled tothe first impedance whereby an increase in amplification is securedand the'space-charge invthe thermionic device is neutralized thereby increasing the rate of electron emissiontherein. Other objects and advantages of my invention will be apparent from the following description taken in connection with the accompanying drawing in which The single figure is a schematicdiagram of a preferred embodiment of my invention.

Referring to the single figure, the electron device 1 comprises a cathode or filament 2, an anode or plate 5, a main grid element l, and an auxiliary grid element 3 for partially'or totally neutralizing the space charge in the device. The filament 2 may be suit-- ably heated from a source ofpower 6, the

heating current being controlled bythe variable rheostat 7 The main grid filament circuit comprises 40 main grid 4, the other end of which is'connected to a suitable point on the potentiometer 18, which is connected across the source of power 6. The source of oscillation 17 is connected across the coil 8 and a variable condenser 9 may be also connected across coil 8 for appropriately tuning the circuit to the oscillations.

The plate filament circuit comprises an oscillation responsive device 14, a coil 16 and a a coil 8 one end of which is connected to the source of power 13 all connected in se'riesas shown. The auxiliary grid element'3 maybe connectedto anyone of varioustaps brought out from the source of power 13 for vary T ing'the positive potential bias onthe auxil- ,iary grid element 3. 1 I I In the event that the auxiliary grid element 3 is not connected to thesame tap from the source of'power13 as the plate element '5, a condenser 20 may be connected between the said connections for by-p'assing high fre- Y quency oscillations. A variablecondenser1 91 1 also be connected as shown for app'ropriatelytuning its associated circuit to the oscillations. The coils 8', l5, and16 are induo 55 tively coupled, thejcoupling-between all 'or any two of said coils being adjustable from zero coupling to a comparatively large degree of coupling in either direction from zero coupling. l ZgIf' the spacecharge an electron 'device is totally or partially'neutralized, the pas- 1 sage of electrons ffrom the cathode to the anode is greatly accelerated,-thereby resulting in therequirement of a comparativelyv 5 small source of plate-"or anode potential for a given value of plate or anode current. In the systemdescribed above, this space charge is totally or partially neutralized by means of the auxiliary grid element 3 which has a positive potential bias imparted to it from the source of power 13.. Due to the fact that the various coils 8,15, and-16 are inductively and variably coupled," regeneration can be efiected resultingin a comparatively large degree of amplification of the-'oscillation-impressed on'the system. The autodyne reception, detection, and amplification of oscillations is also made possible by. the above described system. 7 Satisfactory reception, detection and amplification of oscillations may be also realized by :the above described system when the source of power 13 is dispensed with.

In the case where the arrangement com- 9 prises several stages of amplification, 'additional inductive couplings could be provided; between the different stages for controlling thedcgree of amplification.

,.While I have shownanddescribed apre- 10.0

ferred embodiment of my invention I do not limit myself to the same but may employ such other modifications as come within the spirit and scope of my invention.

I claim: 7 I

1. The combination with a thermionic device having the usual input electrodes connected externally of the device through an impedance and a plate electrode, oi an auxiliary grid interposed between the input electrodes and suitably biased through a sec- 0nd impedance from the plate supply for neutralizing the space charge in said device thereby increasing the rate of electron emissiloi:1 therein, both said impedances being coup e V 2. In'combination in a space discharge device provided with a cathode, anode and control electrode and having its input and output circuits inductively coupled, of a fourth elec-v trode interposed between the input electrodes forming the input circuit, and connected' through an inductance to the plate source, saidinductance being coupled to both input and output circuits.

3. The combination with an electron discharge device having the usual cathode, grid and plate electrodes, of an input circuit COILf nected between said cathode and grid electrodes, an auxiliary grid electrode inter;- posed between said cathode and grid, an out put circuit including a source of high potential connected between the plate and cathode, a third circuit connected between the auxiliary grid and the source of high potential and spect to the cathode andbeing connected to the anode supply though an impedance, the usual grid being connected to the cathode through a second impedance which is coupled to the first impedance.

HENRI LEON AUGUSTE FRANQOIS NOZIERES.

meansfor variablv and inductively coupling a said mentioned circuits. or

4. A circuit arrangement comprising a vacuum tube having a main grid and an auxiliary grid, an input circuit includingsaid main grid, an output circuit including a source of high potential, an auxiliary grid circuit connected between said source of potential and the auxiliary grid, and aninductance'in each of said mentioned circuits coupled to one another for providing a variable coupling between the circuits.

' 5. A circuit arrangement comprising a vacuum tube having'a main grid and an auxilia ry grid, a cathode and an anode, a source of charge grid havinga high'potential with re 

